/*
 * Copyright 2023 devaper
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package io.github.devaper.pigeon.support.component

import io.github.devaper.pigeon.component.*
import io.github.devaper.pigeon.request.*
import io.github.devaper.pigeon.response.*
import io.github.devaper.pigeon.util.*
import java.lang.reflect.*
import java.nio.charset.*

/**
 * 纯字符串的消息转换器
 */
class StringHttpMessageConverter(
    private val defaultCharset: Charset = StandardCharsets.UTF_8
) : HttpMessageConverter {

    private val defaultMediaType = MediaType("text", "plain", defaultCharset)

    override fun serialize(requestTemplate: RequestTemplate, value: Any?) {
        if (value == null) {
            return
        }
        requestTemplate.addHeader("Content-Type", defaultMediaType.toString())
        requestTemplate.requestBody = value.toString().toByteArray(charset = defaultCharset)
    }

    override fun deserialize(responseTemplate: ResponseTemplate, type: Type): Any? {
        if (responseTemplate.bodyBytes == null) {
            return null
        }
        val targetMediaType = MediaType.parse(responseTemplate.contentType)
        val charset = targetMediaType?.charset ?: defaultCharset
        return String(responseTemplate.bodyBytes, charset)
    }
}